78990159 has 4 divisors (see below), whose sum is σ = 105320216. Its totient is φ = 52660104.

The previous prime is 78990157. The next prime is 78990167. The reversal of 78990159 is 95109987.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78990159 - 2¹ = 78990157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78990157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13165024 + ... + 13165029.

It is an arithmetic number, because the mean of its divisors is an integer number (26330054).

Almost surely, 2^78990159 is an apocalyptic number.

78990159 is a deficient number, since it is larger than the sum of its proper divisors (26330057).

78990159 is a wasteful number, since it uses less digits than its factorization.

78990159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26330056.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 78990159 is about 8887.6408005724. The cubic root of 78990159 is about 429.0662250173.

The spelling of 78990159 in words is "seventy-eight million, nine hundred ninety thousand, one hundred fifty-nine".